package com.nowcoder.community.controller.interceptor;

import com.nowcoder.community.entity.LoginTicket;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.impl.UserServiceImpl;
import com.nowcoder.community.util.CookieUtil;
import com.nowcoder.community.util.HostHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.context.SecurityContextImpl;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.time.LocalDateTime;

/**
 * @author cjh
 * @date 2023/1/4 - 11:21
 */
@Component
public class LoginTicketInterceptor implements HandlerInterceptor {
    @Autowired
    UserServiceImpl userService;

    @Autowired
    HostHolder hostHolder;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//从cookie中获取凭证
        String ticket = CookieUtil.getValue(request, "ticket");
        if (ticket != null) {
            LoginTicket loginTicket = userService.findLoginTicket(ticket);
            if (loginTicket != null && loginTicket.getStatus() == 0 &&
                    loginTicket.getExpired().isAfter(LocalDateTime.now())) {

                User user = userService.getById(loginTicket.getUserId());
//                在本次请求中持有用户  使用了线程隔离
                hostHolder.setUser(user);

//                构建用户认证的结果 并存入SecurityContext 以便于security进行授权
                Authentication authenticationToken = new UsernamePasswordAuthenticationToken(
                        user,user.getPassword(), userService.getAuthorities(user.getId())
                );
//                这个holder类似于 我们自己的hostholder
                SecurityContextHolder.setContext(new SecurityContextImpl(authenticationToken));

            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        User user = hostHolder.getUser();
        if (user!=null && modelAndView !=null){
            modelAndView.addObject("loginUser",user);
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        hostHolder.clear();
    }
}
